Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cu tren » tu tren, dua tren
cua tre » cua te, cuu tre, cua triet
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
van cam » van nam, van lam, van cau
nang ho » nang hoc, nang co, tang ho
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ro, nang x
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang o) or (nang ho)) hoi. hieu van cam xuc va danh vi ((cua tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang o) OR (nang ho)) hoi. hieu van cam xuc va danh vi ((cua tre) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang o) or (nang ho)) hoi. hieu van cam xuc va danh vi ((cua tre) or (cu tren))*.